Hollow blast revoluble grate



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W. E. PAYNE 8u F. L. JOUBERT. HOLLOW BLAST RBVOLUBLE GRATE. No. 595,649. Patented Deo. 14,1897.

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HOLLOW BLAST RBVOLUBLB GR'ATE.

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NITED STATES PATENT Erice.

WALTER E. PAYNE AND FREDERIC L. JOUBERT, OF NEW ORLEANS, LOUISIANA.

HOLLOW BLAST REVOLUBLE GRATE.

SPECIFICATION forming part of Letters Patent No. 595,649, dated December 14, 1897. Application filed November 20, 1896.y Serial No. 612,853. (No model.)

To @ZZ whom t may concern:

Be it known that we, WALTER E. PAYNE and FREDERIC L. JOUBERT, citizens of Athe United States, residing lat New Orleans, in the parish of Orleans and State of Louisiana, have invented a new and useful Improvement in Hollow Blast Revoluble Gratos, of which the following is a specification.

Our invention relates to such furnaces or ovens as are used in connection with the manufacture of sugar from the different varieties of the sugar-cane, the saccharine juices having first been extracted therefrom by a suitable process, the resulting residue known as bagasse being thereby rendered available for utilization as fuel in generating steam and the objects of our invention are to provide a fire-grate to form a part of such furnaces as will permit of the application of a forced blast of air directly to the bagasse upon the grate Without intervening obstacles, thereby producing a more intimate combination and a more thorough mixture of the resulting gases of combustion, and to construct a grate facilitating access to all its parts lfor repairs thereto and for the removal of ashes and slag. We attain these objects by the construction shown in the following drawings, in which- Figure 1 is a plan of the grate, showing a portion thereof with the grate-bars in position. Fig. 2 is avertical section through the same on the line A A. Fig. 3 is a plan of one of the hollow blast grate-bars which we employ. Fig. 4 is a section through the same on line B B. Fig. 5 is asection through same on the line C C. Fig. 6 is a section through same on the line D D. Fig. 7 is a plan of one of our plain grate-bars. Fig. 8 is an elevation of the same. Fig. 9 is a section through one of the hollow radial arms g on the line E E. Fig. 10 is a plan of the same. Fig. 11 is a section through the radial arm g on the line F F. Fig. l2 is a plan of the central blast-plate. Fig. 13 is a section through the same. Fig. 14 is an elevation of the central hand-hole cover. Fig. 15 is a plan of the same. Similar parts are designated by the same 5o letters throughout the different views.

The blast is introduced through the pipe a,

passing thence into the central post b, which, with the rim-rollers c, placed at intervals around the periphery of grate, supports the entire construction. the base-plate CZ, which is itself anchored to the foundation at the center of the furnace and sufficiently far below the surface of the ash-pit to allowthe blast-pipe to be connected to the post b without obstructing the ash-pit. At a convenient distance below its upper end the post ZJ is provided with a grooved collar. The slotted cylinder e is flanged at its lower end and is recessed throughout a part of its length to receive the projecting end of the post b above its collar, the engaging surfaces being turned perfectly true, thereby insuring an air-tight joint. 4

The iiange on cylinder c is grooved correspondingly to the collar on b, and a sufficient number of perfectlyspherical balls f are placed between them, permitting the grate to be turned with a minimum of effort at the crank Z. The radial arms g are bolted to the outer surface of the cylinder e, their outer ends being anged at the top and bottom, the lower flanges carrying a circular rack and rail h and the upper flanges bearing a circular rail j to support the outer ends of the grate-bars. The intermediate rail Za is provided with an additional support for the grate-bars. The radial arms g are provided with a hollow box at their inner ends, each having a hollow branch on either side, each one of these branches being fitted to the under side of one of the hollow grate-bars Z and fastened thereto with bolts, making an air-tight joint. `The hollow grate-bars Z are of a rectangular section and conform to a segment of a circle, having a branch extending to either side at its widest end. As shown in Figs. 5 and 6, the sides are perforated near the upper corners, these perforations occurring at all edges, excepting The post b is bolted to l the small end toward the center of grate and at the ends of the tWo projecting branches. These perforations occur at intervals, they being so disposed as to distribute the airblasts equally to all parts of the grate.

By inspecting Fig. l it will be seen that the outer periphery of the grate is entirely formed by the hollow blast-bars Z, and the object of this being to completely encircle the grate ico' with an upward blast of air, thereby preventing the adhesion of the grate tothe interior surface of the furnace, due to fiuid vitreous matter resulting from the combustion'of the bagasse.

In order to produce a further distribution of the blast, each hollow bar is providedA with perforated recesses, these being partially filled by a circular piece m, bolted to the bar, this piece being of smaller diameter to permit of the passage of the blast and at the same time preventing the recess being filled with dirt. The slotted grate-bars n fill up the spaces between the hollow bars l and are provided with lugs on each side and at the outer end, these lugs insuring a uniform space between the edges of the hollow and the slotted bars, through which the blast reaches thesur'- face of the grate. The purpose of the'slotted bars is to allow the ashes and other residue of being raked and precipitated to the ash-pit below. The central blast-plate p completes the surface of the grate and is bolted to the upper end of the cylinder e, a narrow space being left between the edge of the plate p and the inner ends of the grate-bars to permit of thepassage of the blast from the perforations in the crown of plate p. At the centerof this plate is a hand-hole encircled with'a'perforated crown similar to that at the outer edge. At the lower edge of this crown and onY itsA inner surface is a continuous collar, which serves as a rest for the hand-hole cover-piece r, this piece being dropped in position through the wards in the upper collar and locked in position` by the engagement of the wards in the cross-ribs between the two disks, forming part of cover-piece o', a partial turn sufiicin g tolock them together.

At the outer edges of the cover-piece are formed a sufficient number of projections to insure a narrow opening for the discharge of the blast. The disk at the bottom of the cover-piece overlaps the lower collar on the crown: and prevents the escape of air through the hand-hole. At the outer side of the upper disk of cover-piece r several recesses are formed to engage corresponding pins on a key or turning-wrench when it becomes necessary to remove the cover.

The combination pinion and roller s, Fig. 2, consists of a ianged wheel with hub, a narrow fiat ridge being raised at one end of the outer surface of ange, a narrow intervening groove being provided between said ridge and the pinion-cogs, likewise situated at the outer surface of flange, these cogs engaging similar cogs on the circular piece 7L at the circumference of grate, the rail on 7i bearing on the ridge formed ou s and substituting one of the rim-rollers c, thereby obviating the necessity for an additional roller being placed near the pinion. The diameter of the roller formed on s is madeequal to the pitch diameter of the pinion, thus gi'vingboth roller and pinion parts the same velocity of travel. Suitable bearings are provided to support the pinion-shaft w and brackets yy for supporting the rim-rollersc, these being placed at proper intervals around the inside of the furnace and, bearing against the rail on h, support the periphery of the grate.

It will be seen that the travel of the blast ,is unbroken from the blower through pipe a` into post l) and through the openings in c into the hollow arms g, and thence into the hollow grate-bars l, and finally emerging at the various and numerous perforations in the hollow bars and central cover-plate.

By applying a moderate eifort at the crank it the grate will be rotated and any portion thereof brought opposite the fire-doors, as o, making it accessible from the outside.

What we claim, and desire to secure by Letters Patent, is as follows:

l. In a' revoluble circular grate,`segmental grate-bars, of hollow box section, hollow branches projecting laterally at largest end of bars; perforations being provided at proper intervals along the upper corners of box and branches, for the discharge of air-blast, said openings having an upward inclination toward outside of bar; each bar being provided with perforated blastrecesses, and covers m therefor, openings being provided at lower side of bars for the introduction of air from hollow radial arms f, said openings having a faced jointing-strip all round,. making airtight joints with a corresponding. strip on hollow arms when' these are bolted together: substantially as set forth.

2. In arevoluble circular grate a central hollow cylinder or hub c, said hub supporting at its outer surface, hollow radial arms g, said radial arms-being bolted thereto, making airtight joints; openings being provided for the entrance of air-blast into said hollow arms; a grooved iiange being provided at lower end of cylinder, said flange forming with a collar on post d, the receptacle for spherical bearing-rollers; innersurface at lower end of cyl- -inder being recessed, said recess with projecting end of postb forming an air-tight movable joint: substantially as set forth.

3. Ina circular revoluble grate, radial arms forming at one end a hollowbox with flange at open end, arms being bolted to a central cylinder e at corresponding air-passages therein, making therewith air-tight rigid joints; hol- ,low branches projecting upward from each side of box; said branches being connected rigidly to under sides of hollow grate-bars, vopposite air-entrances therein, making airtight rigid joints therewith; remainingportion of radial arms being of a T-section; a foot being provided at lower edge of vertical web of T, said feet carrying a circular rack .and rail and bolted thereto; horizontal web carrying circular rails supporting grate-bars: lsubstantially as set forth.

4. In a circular revoluble grate, the circular cover-plate 1J provided at outer edge with a cylindrical crown, said crown being, perforated at intervals with blast-holes an annu- IOO IIO

lar space being provided between inner ends of grate-bars and outeredge of plate, allowing passage of air-blast; provision being made for rigidly attaching cover -plate to cylindrical hub e; a hand-hole being provided at center of plate; a cylindrical crown being formed at edge of hand-hole, a continuous collar being formed near lower edge of crown at its inner surface anotched collar situated above continuous collar at inner surface of crown, said collars constituting means for supporting and attaching hand-hole cover r: substantially as set forth.

5. In a circular revoluble grate, the circular hand-hole coverngsaid cover being formed ofl two parallel circular disks of unequal diameters, and radial webs perpendicular to the plane of and converging at the center of said disks,webs being notched, said notches fitting around a corresponding collar in the crown of hand-hole in cover-plate p for locking cover in place; projecting lugs bein gforrned around the edgeof larger disk to keep cover-plate centrally in position in hand-hole, and permitting passage of blast: substantially as set forth.

6. In combination with a circular revoluble grate, a pinion xed at one end of a shaft,

lsaid shaft being supported by suitable bear- WALTER E. PAYNE. FREDERIC L. JOUBERT.

Witnesses:

CHAS. A. JOUBERT, J. M. CROWLEY. 

